So I got an unexpected promotion this week; now to blow a bit of money on lenses! I'm trying to get wider than 14mm, but it's a very, very hard choice. Here's what we've got:Advertisement Panasonic 7-14: Pros: Image quality, constant aperture. Cons: Relatively big, no filters, not overly bright. Olympus 9-18: Pros: Size, more useful length for a walkaround lens, cost. Cons: Not bright enough for dark rooms, soft corners. Olympus 12: Pros: Brightness, image quality, distance scale, size. Cons: Not that much wider than much cheaper 14mm's. So, which did you choose and why?